If the distance from a point source of sound is doubled; by what factor does the intensity decrease?
A. 4.00 B. 2.00 C. 0.50 D. 0.25 Correct Answer: Option A – 4.00 Explanation In general, the intensity of a wave is the rate of flow of energy across unit area normal to the direction of propagation of the wave intensity α1/r2 where r is the distance away from...
At what position will an object be placed in front of a concave mirror in order to obtain an image at infinity?
A. At the pole of the mirror B. At the principal focus C. at the center of the curvature D. Between the principal focus and the center of curvature Correct Answer: Option B – At the principal focus Explanation For a concave mirror to produce an image at...
The phenomenon where by the water droplets in the atmosphere combines with dust particles in the air to reduce visibility is?
A. cloud B. mist C. hail D. fog Correct Answer: Option D – fog
If an object is placed between two parallel plane mirrors with their reflecting surfaces facing each other; how many images of the object will be formed?
A. Infinite B. Eight C. Four D. Two Correct Answer: Option A – Infinite Explanation The number of images to be observed will be infiniteProducts
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